[Elecraft] [K3] Shorting K3 PHONE jack outputs (WAS OT: Stereo to mono adapters)

[Don Wilhelm]

  Fred,

That "circuit" nomenclature has a lot of other people confused, and even 
some confusion has crept into parts catalogs (but not the mainstream 
distributors).  I have seen stereo plugs and jacks called both 2 circuit 
and 3 circuit - I guess they might refer to the number of pins - then 
there may be extra contacts in the jack and I have seen a mono jack with 
a closed circuit output pin also referred to as a 3 circuit jack - I 
guess was because it has 3 pins (circuits?).  Talk about being confused 
- and frustrated after you receive the order - I won't order from that 
source again.

73,
Don W3FPR

On 12/3/2010 5:03 PM, Fred Jensen wrote:
> What is a "3-circuit phone plug?"  I know about 1-circuit plugs
> [tip-sleeve providing one circuit] and 2-circuit plugs [tip-ring-sleeve
> providing two circuits -- tip-sleeve and ring-sleeve].  Is this
> referring to 2-wire and 3-wire plugs?  I've seen on the list here that
> the wrong plug will blow the AF amplifier.
>
> I followed the legends on the back panel and I don't use the front panel
> mic or headfone jacks.  Where it said MONO, I use a 1-circuit plug,
> STEREO gets a 2-circuit plug.  I use cables from Radio Shack between
> sound card and radio and they seem to work fine.  I really hope I'm not
> screwing something up in my radio.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 2011 Cal QSO Party 1-2 Oct 2011
> - www.cqp.org
>
> On 12/3/2010 12:38 PM, Don Wilhelm wrote:
>>     James,
>>
>> That is incorrect.  If you plug a 3.5mm mono plug into the adapter, it
>> will short between the ring and sleeve on the 1/4 inch side too.
>>
>> 73,
>> Don W3FPR
>>
>> On 12/3/2010 2:45 PM, James Sarte (K2QI) wrote:
>>> I'm assuming however that a 2 circuit plug into a 3 circuit adapter should
>>> be fine; i.e. plugging a 3.5mm mono plug into 1/4" stereo to 3.5mm stereo
>>> adapter, which is then inserted into the 1/4" phone socket?
>>>
>>> Tnx,
>>> James K2QI
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